Make sure you know where your table should start and end. (Hint: Where does your integral start and end?)
A 
B 
C 
D 
E 

1 
height 
diameter 
pi*r^2 

trapezoidal 

2 
(ft) 
(in) 
(ft^2) 
Const 
rule 

3 
0 
8.3 
0.3757367 
1 
0.3757367 
Remember, you're setting up the trapezoidal rule with pi*r^2 in square feet, not the diameter in inches. 
4 
5 
7.9 
0.3403937 
2 
0.6807875 

5 
10 
7.4 
0.2986695 
2 
0.5973389 

6 
15 
7 
0.2672535 
*** 
*** 

7 
20 
*** 
*** 

8 
*** 
*** 


9 
*** 



10 

11 
SUM: 
??? 

Height and diameter come from your table. (Make sure you know where to start and end!)  You will need to convert to radius, and to feet! (Pi is entered as PI() in Excel formulas.)  The
rest of this is just the trapezoidal rule. Remember to multiply the sum by 5/2. 